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41 votes
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Why does the Eurofighter Typhoon pitch up on brake release?

When the brakes are on, they apply a backwards force that counters the engine thrust. This force is applied at ground level, and the engine thrust is higher. These two forces result in a moment that ...
Robin Bennett's user avatar
32 votes
Accepted

Why there so many pitch control surfaces on the Piaggio P180 Avanti?

Surface 1 is a horizontal stabilizer with elevator, just the same as on any other aircraft with a T tail arrangement. Surface 2 is called a rear strake or a tail fin. There is one on each side of ...
Jpe61's user avatar
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18 votes

What are the exact meanings of roll, pitch and yaw?

The key thing missing in your interpretation is that the order is important. Applying the same roll, pitch and yaw angles in a different order will result in a different orientation (mathematically ...
Bianfable's user avatar
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17 votes

Why does an aircraft pitch up when the speed increases?

What you ask is: If a model glider is thrown at a higher speed than its trim speed, why does it pitch up? Short answer: Because the rear horizontal surface produces less lift per area than the ...
Peter Kämpf's user avatar
17 votes

Why does RPM for a fixed-pitch propeller change with an aircraft's pitch?

The driving variable here is airspeed, not pitch attitude per se. Your airplane naturally goes faster when you put the stick forward and decrease the wing's angle-of-attack, and this changes the prop ...
quiet flyer's user avatar
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14 votes

What pitch attitudes are common during an emergency descent for an airliner?

My experience was on the Regional Jets but from sim training I recall that the pitch down once at Vmo with flight spoilers extended was somewhere around 10-15 deg. The standard procedure for the CRJ ...
John K's user avatar
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13 votes
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What is the name for yaw, pitch and roll together?

Roll, pitch and yaw are referred to in one word as the attitude.
Invariant's user avatar
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13 votes
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What pitch attitudes are common during an emergency descent for an airliner?

It is not as nose down as you may think. First, let us have a look at normal pitch attitudes during a normal descent (without speedbrake). These can be found in the QRH Performance Inflight Tables: (...
Bianfable's user avatar
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13 votes
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Why did Concorde have a max pitch down attitude in supersonic flight?

I'm assembling this answer mostly based on Concorde operating manual, volume 2, in French. ADI The Attitude & Director Indicator is (was) actually a superb instrument, only outdone by the Orbiter ...
mins's user avatar
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12 votes

Why does the Eurofighter Typhoon pitch up on brake release?

Look carefully and you can see the nose strut is compressed down to only a few inches of chrome as the thrust applies a torque moment, or nose down pitching moment, about the fixed axis of the main ...
John K's user avatar
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11 votes
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Can computer imposed inputs be overridden on the Boeing 737-MAX?

The new 737 MAX has a more advanced pitch control system called maneuvering characteristics augmentation system (MCAS), which automatically adjusts the stabilator trim in case of high thrust and high ...
Bianfable's user avatar
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11 votes

What is the aerodynamic centre and how does it relate to the pitching moment?

A pitching moment is every moment acting around the lateral axis. Since a moment is the combination of a force and a lever arm, the magnitude of the moment depends on the choice of reference point, ...
Peter Kämpf's user avatar
9 votes
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What are the exact meanings of roll, pitch and yaw?

What are the exact meanings of roll, pitch and yaw? It depends somewhat on whether you are speaking from a pilot's point of view or from an engineer's point of view. Your reference to yaw, pitch, ...
quiet flyer's user avatar
  • 22.8k
8 votes

What are the exact meanings of roll, pitch and yaw?

Roll, pitch, and yaw have two different meanings. They can refer to either Euler angles, which describe the attitude (orientation) of an aircraft, or ways that an aircraft can rotate. Euler angles ...
Tanner Swett's user avatar
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8 votes
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What is the maximum pitch achievable in a medium-powered airplane?

I'm going to assert that most aircraft are capable of momentary vertical climb, even ones with zero engine power. Achieving vertical upwards pitch is not about engine power, it is about momentum. An ...
Jpe61's user avatar
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7 votes

Why does an aircraft pitch up when the speed increases?

The horizontal stabilizer always provides a downward force to balance the forces of lift and weight with the centre of gravity. This also provides stability because if the aircraft pitches down and ...
Mike Sowsun's user avatar
  • 37.8k
7 votes

What 's the difference between Angle of Attack and Pitch?

The reference of pitch is the horizontal. The reference of AoA is the direction of the relative wind.
xxavier's user avatar
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7 votes

Why did Concorde have a max pitch down attitude in supersonic flight?

The fixed mark at 5.5 degrees of pitchdown on the Concorde ADI was a reminder for the pilots that, flying at Mach 2, the corresponding vertical speed would be 18000 ft/ mn. Even flying at 55000 ft, ...
Eric Celer's user avatar
7 votes

Do aircraft pitch down even at very low angles of attack (below 0°) in a strong sideslip?

As John K was alluding, AoA of -10 or -15 are not really practical and do not correspond to a powered dive like you think. Even in a descent or a dive, most aircraft will have positive AoA. You are ...
Rob McDonald's user avatar
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7 votes

If the pitch of a bypass fan blade in a turbofan is fixed how does it manage to provide thrust over such a large speed range?

A large part of this is provided by the turbofan inlet design. Above pic is from Aircraft Gas Turbines by C.J.Houtman and was used earlier in this answer: the inlet shape slows the incoming air down ...
Koyovis's user avatar
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6 votes
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Why does the DHC-6 pitch down when the flaps are retracted, rather than up?

The Twin Otter isn't unique. Flaps have varying effects on different airplanes. Some pitch up with flaps extended, some pitch down. The pitching moment from flaps isn't just from the nose down ...
John K's user avatar
  • 132k
6 votes

What are the exact meanings of roll, pitch and yaw?

The attitude angles are explained in this wikipedia page, but it seems your confusion stems from the fact that they can present a singularity. Each set of unique Euler angles, outside of the gimbal ...
AEhere supports Monica's user avatar
6 votes

Sudden "nose-down" event during a normal flight in normal weather conditions

Well, the direct cause of such a sudden maneuver is almost certainly pilot action, rather than a system failure. Either a sudden change of autopilot settings (although the autopilot has rate limits, ...
TypeIA's user avatar
  • 14.4k
5 votes

What is the name for yaw, pitch and roll together?

Pitch, roll and yaw are rotation angles relative to the earth gravitational field. In order to fully describe the state of an unrestrained rigid body in space, there are six Degrees of Freedom ...
Koyovis's user avatar
  • 61.8k
5 votes

How are pitch angle and pitch rate measured in an airplane?

There are three principle competing electronic technologies replacing vacuum and electric powered gyros. Higher end systems use ring laser gyros (RLG), and rely on interference pattern changes to ...
mongo's user avatar
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5 votes
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How are pitch angle and pitch rate measured in an airplane?

The pitch of an aircraft relative to the horizon is observed on the Attitude Indicator which also displays roll angle. These are required for IFR flight but not VFR flight here in the US. As such they ...
Dave's user avatar
  • 101k
5 votes

Why does RPM for a fixed-pitch propeller change with an aircraft's pitch?

Because airspeed influences the effective angle of attack of your propeller blades. Consider what happens when you move this propeller from a stable cruise condition to a dive. In a dive, the ...
AEhere supports Monica's user avatar
5 votes
Accepted

Do the speed brakes on an F-16 change its pitch?

Because the speed brakes are tail mounted, and because they deploy upwards and downwards equally, pitch should not change. The airplane's fly-by-wire system likely dampens any slight pitch changes ...
Camille Goudeseune's user avatar
5 votes

Why does the Eurofighter Typhoon pitch up on brake release?

Here's what's going on. You have two major compressible elements on the landing gear: the "oleos". Movement is not possible anywhere else. You can imagine a line straight through them. The ...
Harper - Reinstate Monica's user avatar

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